<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <script src="vue.js"></script>
</head>

<body>
  <div id="app2">
    <div @click="btnClick">
      {{content}}
    </div>
    <item></item>
  </div>

  <script>
    Vue.component('item', {
      template: '<div>hello item</div>'
    })

    var vm = new Vue({
      el: '#app2',
      data: {
        content:'hello'
      },
      methods: {
        btnClick: function() {
          alert('333');
        }
      }
    })

    
  </script>

</body>

</html>